Gladly. Okay so the major parties right now are:
Zeros', Duilin, Zion, Xenai, Aegidius and Rink, who are a bit outside Bandervil. They are following...
Draven, Horus, Kerig and an invisible spirit named Weloss who are trying to find some secret area that apparently Horus was created at.
Aura and Tsu, who left this town that has just been destroyed and found another quiet little village and are resting there.
Ein, Marshall and Alex, who are at the northern shorelines, near by a village that is soon be taken over by the Kandarin. They are split apart right now, but not to far away, Alex is fishing at a near by river, Ein is sitting on a rock a bit further away and Marshall is guarding their little camp.
There is a person who is assuming the name of Afelan who has been assigned to kill Ein. Afelan is currently trying to fight Ein.
Nick, who is patiently standing in the middle of the destroyed city that Aura and Tsu were previously at.
There are also a couple other groups, but they are at secret and private locations and it's best not to get involved with them just yet.
The main story is that the Kandarin are conquering many parts of the Dark Continent. There is also apparently some secret area that creates deadly life-like machines (robots I guess), Draven is trying to find that right now.
Draven's Crimson Empire used to be very large, however it was nearly wiped out by the Grey Empire in Chapter 8 and 9. The Grey Empire was ultimately defeated by the Aspyes at the end of Chapter 9.
Quite secretly the old Dark Empire is being rebuilt, at a secret unknown location. It could be some underground city or maybe even another dimension. (I guess that is Xorlak's way of not allowing people into that location uninvited.)
(Did I miss anything important?)
If you have any questions on whom any of the named characters or locations and groups are, just check DALpedia. Most of the information on DAL, is up there.
As for how you can jump in, perhaps you could have your character be walking along and stumble across one of the groups listed.